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Republican presidential candidate Newt Gingrich got the Republican candidates debate in Charleston off to a lively start Thursday night with an angry denial of charges a former wife made in an interview that came two days before the South Carolina primary.

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The Republican presidential candidates assembled in Spartanburg, South Carolina, last night for a primary debate, the first to focus entirely on foreign policy and national security. In a dialogue that spanned assorted geopolitical challenges -- including Iran's quest for nuclear weapons, America's strategic relationship with Pakistan, and trade with China -- the eight Republicans outlined the approaches they would take to diplomacy if elected head of state. Here are five of the most notable exchanges:

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Night desk reporter in the Washington Bureau. Holds a Masters degree in Interactive Journalism and currently working on merging new media skills with old media experience. Prior to joining Reuters, worked in broadcasting at two other international wire services (which I won't name here). A perpetual piano student, and not very good, which is perfect for my secret ambition -- lounge piano player.